#include <cs50.h>
#include <stdio.h>

int main () {
	printf("请输入第一个数: ");
	int a = GetInt();
	printf("请输入第二个数: ");
	int b = GetInt();
	printf("请输入第三个数: ");
	int c = GetInt();

	float average = (a + b + c) / 3.0;
	printf("平均数是：%.2f\n", average);
}
